Putting damaged goods back on the selve

I went to buy a bag for my gf for Valentines day, I showed one of my friends the bag and they showed me the marks on the bag. I returned it the same day and went to look for a new bag and when I came to the shop they put the bag as is back on the shelf and the rest of the bag had the same stains on it. I then called them about it to lay a complain with the manager on 12 February 2015 and I was told that the manager will get back to me. Up until today I did not hear from the manager. I also complained about other products having one price on the shelf and then when we get to the till we are expected to pay more. They did not bother to contact me till today.